Titanichthys Jaw

Titanichthys had a distinctive lower jaw bone, called an inferognathal, on each side of its mouth. They were long (nearly two feet in adults) and curved, ending in a sharp point that looked like a fang. Its lower jaw differed from other arthrodires, with a deep groove behind the point instead of a bladed edge. Research indicates that the pointed tips of Titanichthys’ lower jaws naturally pointed down instead of up, possibly anchoring a strip of soft tissue that stretched between the two jaw tips and helped the fish strain plankton from incoming seawater for food, like modern basking, whale, and megamouth sharks do.